If this video passes 100 likes by next week's episode, then I will announce the winner in episode 8. In this episode of ...

A polarized filter, or lens, blocks one of the planes, or phases. In polarized glasses, one lens blocks the vertical phase, the other the horizontal.

Many people know how helpful polarized sunglasses are in cutting the glare coming off water on a sunny day. But a filter that could let people see — or block out — all the polarizations of ...